Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 22, Problem 6RQ
Summary Introduction
To review:
The transformations of nitrogen cycle and reactions that are carried out only by microbes.
Introduction:
The nitrogen cycle involves the transformation of nitrogen and nitrogen-containing compounds in nature. The main source of nitrogen includes the Earth’s crust, atmosphere, and organic fertilizers. Plants and bacteria use nitrogen in the form of ammonium or nitrate. Nitrogen is often the most limiting nutrient in soil and water.
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Chapter 22 Solutions
Microbiology: An Evolving Science (Fourth Edition)
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- What is the purpose of the Kreb's Bicycle in nitrogen metabolism? Include in your description where nitrogen enters the cycle.arrow_forwardWhat product is generated by assimilation in the nitrogen cycle.arrow_forwardList the pathways used by microbes to fix CO2, noting the types of organisms (eukaryotes, bacteria, archaea) that use each pathwayarrow_forward
- Which of the following statements is false regarding the electron donors in prokaryotic metabolism? A) O The use of organic compounds as electron donors is known as chemo-organotrophy. B) OLithotrophy refers to the use of inorganic molecules as electron sources. C) O Photolysis of water provides electrons to phototrophic organisms such as cyanobacteria. D) O Electrons can be obtained from inorganic chemicals such as H2S. E) O Oxygen can serve as an electron donor.arrow_forwardWhy must nitrogen fixation occur in an anoxic (i.e., oxygen-free) environment? a)Because H2 is an additional product of nitrogen fixation, and the combination of H2 and O2 would cause the cell to combust. b)Oxygen poisons the dinitrogenase enzyme by entering the FeMo cluster c)Oxygen competes as an electron acceptor in the ETC, so electrons cannot be passed to N2. d)Oxygen "steals" electrons from the dinitrogenase reductase, producing free radicals.arrow_forwardWhat would happen if all microorganisms were to vanish from the nitrogen cycle? Give an explanation for your response.arrow_forward
- Anabolic reactions may be characterized as O 1) producing NADPH. O 2) exergonic. 3) breaking large molecules into smaller molecules. O 4) producing FADH. 5) forming large molecules from smaller precursors.arrow_forwardExplain the process of nitrogen fixation and why it is crucial to all life on earth.arrow_forwardNitrogen is the most common element in the air. Why do bacteria play a role in the nitrogen cycle?arrow_forward
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